Finding the Fourth Proportional to 12,978.87, 17,909.56 and 7,601.88

Step by Step Solution

1. Step 1: Write the proportion equation
   12,978.87 : 17,909.56 = 7,601.88 : x
2. Step 2: Convert to fraction form
   12,978.87/17,909.56 = 7,601.88/x
3. Step 3: Cross multiply
   12,978.87x = 17,909.56 × 7,601.88
4. Step 4: Simplify right side
   12,978.87x = 136,146,325.97
5. Step 5: Solve for x
   x = 136,146,325.97/12,978.87
6. Step 6: Final answer
   x = 10,489.84